The image in the picture is a comet. What characteristics best identifies it as a comet? A.
Comets are streaks of light

B.
Comets are larger than asteroids

C.
Comets enter the Earth's Atmosphere

D.
Comets develop a fuzzy, cloud-like shell called a coma, as well as a tail.

When and why were fingerprints first used in the united states

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.

On a production possibility curve, data points that fall outside of the curve represent what